Improve description

index.html

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                                 <h1>Printrun: 3D printing host suite</h1>
-                                <p>Printrun is a set of 3D printing host softwares<br />(the ones which talk to your printer handling the printing process)</p>
+                                <p>Printrun is a 3D printing host software suite<br /> which talk to your printer and handle the printing process</p>
                                 <p><a class="btn btn-lg btn-primary" href="#download" role="button">Get it</a></p>
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